Add example of plaintext HTTP/1 and HTTP/2.

Author: ioquatix

examples/hello/config.ru

@@ -0,0 +1,16 @@
+#!/usr/bin/env falcon --verbose serve -c
+# frozen_string_literal: true
+
+require 'async'
+require 'async/barrier'
+require 'net/http'
+require 'uri'
+
+run do |env|
+	i = 1_000_000
+	while i > 0
+		i -= 1
+	end
+		
+	[200, {}, ["Hello World!"]]
+end

examples/hello/gems.locked

@@ -0,0 +1,85 @@
+PATH
+  remote: ../..
+  specs:
+    async-http (0.66.3)
+      async (>= 2.10.2)
+      async-pool (>= 0.6.1)
+      io-endpoint (~> 0.10, >= 0.10.3)
+      io-stream (~> 0.4)
+      protocol-http (~> 0.26.0)
+      protocol-http1 (~> 0.19.0)
+      protocol-http2 (~> 0.17.0)
+      traces (>= 0.10.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    async (2.12.0)
+      console (~> 1.25, >= 1.25.2)
+      fiber-annotation
+      io-event (~> 1.6)
+    async-container (0.18.2)
+      async (~> 2.10)
+    async-http-cache (0.4.3)
+      async-http (~> 0.56)
+    async-pool (0.6.1)
+      async (>= 1.25)
+    async-service (0.12.0)
+      async
+      async-container (~> 0.16)
+    console (1.25.2)
+      fiber-annotation
+      fiber-local (~> 1.1)
+      json
+    falcon (0.47.6)
+      async
+      async-container (~> 0.18)
+      async-http (~> 0.66, >= 0.66.3)
+      async-http-cache (~> 0.4.0)
+      async-service (~> 0.10)
+      bundler
+      localhost (~> 1.1)
+      openssl (~> 3.0)
+      process-metrics (~> 0.2.0)
+      protocol-rack (~> 0.5)
+      samovar (~> 2.3)
+    fiber-annotation (0.2.0)
+    fiber-local (1.1.0)
+      fiber-storage
+    fiber-storage (0.1.1)
+    io-endpoint (0.10.3)
+    io-event (1.6.0)
+    io-stream (0.4.0)
+    json (2.7.2)
+    localhost (1.3.1)
+    mapping (1.1.1)
+    openssl (3.2.0)
+    process-metrics (0.2.1)
+      console (~> 1.8)
+      samovar (~> 2.1)
+    protocol-hpack (1.4.3)
+    protocol-http (0.26.5)
+    protocol-http1 (0.19.1)
+      protocol-http (~> 0.22)
+    protocol-http2 (0.17.0)
+      protocol-hpack (~> 1.4)
+      protocol-http (~> 0.18)
+    protocol-rack (0.5.1)
+      protocol-http (~> 0.23)
+      rack (>= 1.0)
+    rack (3.0.11)
+    samovar (2.3.0)
+      console (~> 1.0)
+      mapping (~> 1.0)
+    traces (0.11.1)
+
+PLATFORMS
+  arm64-darwin-23
+  ruby
+
+DEPENDENCIES
+  async-http!
+  falcon
+
+BUNDLED WITH
+   2.5.9

examples/hello/gems.rb

@@ -0,0 +1,4 @@
+source "https://rubygems.org"
+
+gem "async-http", path: "../../"
+gem "falcon"

examples/hello/readme.md

@@ -0,0 +1,63 @@
+# Hello Example
+
+## Server
+
+```bash
+$ bundle update
+$ bundle exec falcon serve --bind http://localhost:3000
+```
+
+## Client
+
+### HTTP/1
+
+```bash
+$ curl -v http://localhost:3000
+* Host localhost:3000 was resolved.
+* IPv6: ::1
+* IPv4: 127.0.0.1
+*   Trying [::1]:3000...
+* Connected to localhost (::1) port 3000
+> GET / HTTP/1.1
+> Host: localhost:3000
+> User-Agent: curl/8.7.1
+> Accept: */*
+> 
+* Request completely sent off
+< HTTP/1.1 200 OK
+< vary: accept-encoding
+< content-length: 12
+< 
+* Connection #0 to host localhost left intact
+Hello World!⏎
+```
+
+### HTTP/2
+
+```bash
+$ curl -v --http2-prior-knowledge http://localhost:3000
+* Host localhost:3000 was resolved.
+* IPv6: ::1
+* IPv4: 127.0.0.1
+*   Trying [::1]:3000...
+* Connected to localhost (::1) port 3000
+* [HTTP/2] [1] OPENED stream for http://localhost:3000/
+* [HTTP/2] [1] [:method: GET]
+* [HTTP/2] [1] [:scheme: http]
+* [HTTP/2] [1] [:authority: localhost:3000]
+* [HTTP/2] [1] [:path: /]
+* [HTTP/2] [1] [user-agent: curl/8.7.1]
+* [HTTP/2] [1] [accept: */*]
+> GET / HTTP/2
+> Host: localhost:3000
+> User-Agent: curl/8.7.1
+> Accept: */*
+> 
+* Request completely sent off
+< HTTP/2 200 
+< content-length: 12
+< vary: accept-encoding
+< 
+* Connection #0 to host localhost left intact
+Hello World!⏎
+```